while True:
    a=map(str,raw_input().strip().split())
    if a[0]!='@':
        b=a[1]
        num=int(b)

        if int(b)!=1:
            print ' '*(int(b)-1)+a[0]
            while num-1>1:
                for i in range(2,num):
                    print ' '*(int(b)-i)+a[0]+' '*(2*i-3)+a[0]
                    num=num-1
            print (2*int(b)-1)*a[0]

        else:
            print a[0]
        print
    else:
        break